Possible inlet contaminant

Our lab just got a new 8890 GC/5977B Inert Plus single quad MS.  We re using helium, HP-5MS Ultra Inert Column, Ultra Inert split straight liners with glass wool, and inject mostly Methanol.  Solvent blanks are showing indications of hydrocarbons (undane & decane) which I suspect are from the solvent.  We are seeing another peak indicating 1,1,3,4-tetrachloro-1,2,2,3,4,4-hexafluoro-butane.


Has anyone seen this in their system?  What could it be coming from?    

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